Quick reference card, Calibration check loop – ERICO EST401 ERITECH Clamp-on Ground Resistance Tester User Manual
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Quick Reference Card
Included with the EST401 you will find a quick reference card like the one shown here.
This card summarizes all the features of the EST401.
Calibration Check Loop
The calibration loop of 25Ω is provided to perform a quick check of the instruments. Check
the clamp-on ground resistance tester by clamping around the loop; the EST401 should read
between 24.2Ω and 25.8Ω.
* Value is for ambient temperature between 68° and 78°F. Value may differ a few counts
under or above this temperature.
Figure 24
Figure 25
E1154IS06 EST401_5.qxd:E1154IS06 9/25/06 1:46 PM Page 21
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